"First, infants, even ones that seem vulnerable, are highly capable when they are born.  A newborn already has nine months of experience when she is born. She is capable of controlling her behavior in order to respond to her new environment.  Second, babies "communicate" through their behavior, which, although it may not always seem like it, is a rational language. Not only do infants respond to cues around them, like their parents' faces, but they also take steps to control their environment, such as crying to get a response from their caregivers. Third, infants are social organisms, individuals with their own unique qualities, ready to shape as well as be shaped by the care giving environment."- Dr. T. Berry Brazelton